The plight of a party goer

I make a point of telling people when they invite me to parties that i don't do parties for a very few particular reasons. 1. I have terrible social skills and will inevitably say something that i or the host will regret later. 2. I have anxiety and large groups of people make me nervous. 3. People usually expect me to dance and that is really not even an option. I don't find it fun at all and if you force me to do it i'll be even more irritated which brings up back to my social skill problems and anxiety. So a word to the wise. If you expect me to attend your party you should follow these simple rules. Don't ask me to dance. Don't expect me to look happy. And don't be offended if i leave early.